Scattering analysis of passive seismic data

Steve Cole

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ABSTRACT

Blasts set off in a quarry 15 km from the SEP passive experiment site are easily detected, even if they are quite small, using beam steering. These blasts have provided a signal with which various processing techniques can be evaluated before being applied to ambient noise data. One such technique is imaging by looking for evidence of diffraction off near-surface structures. This yields a picture that is fairly consistent but dominated by plane-wave energy arriving in the same direction as scattered waves. One of the most surprising results of the experiment is the observation of many weak near-vertically incident events during nighttime recording. While their origin has yet to be explained, these events are not due to electrical interference.